Export kexec crash FDT address and size to /sys/kernel/kexec_crash_fdt
and /sys/kernel/kexec_crash_fdt_size files to enabled kexec tool to
utilize pre-allocated space kdump FDT.
Signed-off-by: Sourabh Jain <sourabhj...@linux.ibm.com>
---
arch/powerpc/kexec/core_64.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/arch/powerpc/kexec/core_64.c b/arch/powerpc/kexec/core_64.c
index 57afceee53a6..9bc9973ab3d3 100644
--- a/arch/powerpc/kexec/core_64.c
+++ b/arch/powerpc/kexec/core_64.c
@@ -677,6 +677,23 @@ static u32 get_kexec_crash_fdt_size(void)
return 1024*1024;
}
+static ssize_t kexec_crash_fdt_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%lx\n", __pa(kexec_crash_fdt));
+}
+static struct kobj_attribute kexec_crash_fdt_attr = __ATTR_RO(kexec_crash_fdt);
+
+static ssize_t kexec_crash_fdt_size_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%d\n", kexec_crash_fdt_size);
+}
+static struct kobj_attribute kexec_crash_fdt_size_attr = \
+ __ATTR_RO(kexec_crash_fdt_size);
+
+
/* Setup the memory hole for kdump fdt in reserved region below RMA.
*/
static int __init setup_kexec_crash_fdt(void)
@@ -707,6 +724,16 @@ static int __init setup_kexec_crash_fdt(void)
kexec_crash_fdt = __va(kbuf.mem);
kexec_crash_fdt_size = kbuf.memsz;
+ if (sysfs_create_file(kernel_kobj, &kexec_crash_fdt_attr.attr)) {
+ pr_err("unable to create kdump_fdt sysfs file\n.");
+ return -1;
+ }
+
+ if (sysfs_create_file(kernel_kobj, &kexec_crash_fdt_size_attr.attr)) {
+ pr_err("unable to cerate kexec_crash_fdt_size sysfs file.\n");
+ return -1;
+ }
+
out:
return ret;
}
--
2.34.1
